Soluble-dye composition



Patented June 15, 1926.

PATENTS-OFFICE.

JOSEPH mnnnrrr. MATTHEWS, on NEW YORK, N. Y., AssIGNoR TO enomn'nir, INC

' UNITED STATES OF YORK, N. Y., A CORPORATION NEW YORK. I I

SOLUBLE-DYE COMPOSITION.

No Drawing.

This invention relates to dye compositions and particularly to a self contained water soluble dry powder composition for household use in dyeing silk goods.

6 While there are a number of such compositions on the market for cotton, I am not aware of any especially for dyeing silk goods having the necessary requirements of fast dyeing by simple immersion without boiling 10 and non-hygroscopicity and stability when packaged for retail trade. Such an article should also be readily and completely soluble and should not leave specks which tend to spot the goods.

According to this invention, a stable, water soluble dye composition powder accomplishing the above objects and having the above advantages is obtained by combining with an acid dye incapable of being precipitated by free acid or a leveling agent, a solid soluble material supplying free acid in the dye solution, and a leveling agent. Such a suitable material to be used in combination with an acid dye is sodium acid fluoride, which 2 does not precipitate dyes soluble according to this invention for dyeing silk goods. A

suitable leveling agent is sodium sulfate.

Sodium acid fluoride can be used satisfactorily alone, but it grinds up easier if mixed with a minor percentage of soluble inert material such as sodium silico fluoride. I have found that a satisfactory mixture which grinds well and works well in the dye bath is 85% sodium acid fluoride and 15% sodium silico fluoride, but the percentages may be varied from 95 and 5 to '50 and 50 respectively, the more sodium silico fluoride used, the more parts of total mixture required in order to get the same acidity. This invention is applicable to the dyeing of pure silk goods, or to goods in part of other fibres, a particular advantage of the invention being that the acid dyes used have no affinity in acid solution for vegetable fibre and consequently will not stain cotton lace, etc., on silk garments. A suitable composition, as for brown is:

Grams.

application filed September 2, 1925. Serial No. 54,137.

A suitable composition, as' for pink is: if

Q i V I. Grams. Scarlet? R 3 Fast crimson G R .3

Sodium acid fluoride 100 Sodium sulfate. (desiccated) ;1800

These materials are mixed dry and ground into a uniform and very fine. powder. The powder is then packed and sealed in moistureproof paper envelopes for the market. These packages keep indefinitely in good condition without decomposition or caking 0r deteiioratmg the paper. I

The function of sodium acid fluoride is to release free acid in the solution and it also acts as a mordant on silk and helps to fix a faster color. It also makes the silk fibre more lustrous and gives it a body and a scroop that is desirable, especially in garments which are redyed after use. It also acts as a cleansing agent analogous to a sour to throw out impurities and stains from the fibre. It also does not form precipitates in water which speck or cloud the color. The sodium sulfate causes the color to be taken up more evenly and assists in mordanting the silk fibre. The proportion of sodium acid fluoride may vary between limits, the amount employed depending on the particular dyes used and the depth of shade required. The sodium acid fluoride not only releases acid in the solution, but acts as a mordant on silk to help fix a faster color..

It is characteristic of this invention that no boiling is required, but only simple immersion. The proportion of sodium acid fluoride may vary depending on the particular dyes used and the depth of shade required, an excess of sodium acid fluoride being not generally objectionable. This mategoods are preferably first cleaned in neutral soap and then washed several times in warm water to remove the soap.

The dyeing process takes from ten to twenty-five minutes, depending on the depth and shade of color, and the goods are dried after rinsing Well in Warm water.

I claim 1. A stable dry powder water soluble silk dye composition comprising an acid dye, sodium acid fluoride, and a leveling agent.

i 2. A stable dry powder water soluble silk dye composition comprising an acid dye incapable of being precipitated in the presence of sodium acidfiuoride and sodium sulphate, sodium acid fluoride, and sodium sulphate, said composition being readily and completely soluble in warm water and being nonhygroscopi'o and non-'caking when packed.

3. A stable dry powder water soluble silk dye composition comprising'an acid dye, a leveling agent, and sodium acid fluoride ground with a minor proportion of a soluble lnert material.

4. A stable dry powder water soluble silk dye composition comprising an acid dye, a leveling agent, and sodium acid fluoride ground with a minor proportion of sodium silico fluoride.

5. A stable dry powder Water soluble silk dye composition comprising an acid dye, sodium acid fluoride, sodium silico fluoride, and sodium sulphate, said composition being readily and completely soluble in'warm water and being non-hygroscopic and noncaking when packed.

Signed at New York city, inthe county of New York and State of New York this 28th day of August A D 1925., A V: H

JOSEPH MERRITT MATTHEWS. 

